Night, light and flight: light attraction in Trichoptera,Insect Conservation and Diversity

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Night, light and flight: light attraction in Trichoptera
Insect Conservation and Diversity ( IF 3.2 ) Pub Date : 2019-09-06 , DOI: 10.1111/icad.12379
Malin Larsson ₁ , Anders Göthberg ₁ , Per Milberg ₁

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Artificial light is an important and necessary part of urban environments, but light can have substantial direct and indirect effects on populations of various organisms. Urban areas are often situated close to water and thus organisms dependent on water could be especially vulnerable. Trichoptera is one of the most abundant insect orders in freshwater, but its attraction to light has not been analysed in detail.
We contrasted catches in light traps and passive traps at three locations in Sweden.
The results showed that artificial light can affect Trichoptera populations. Attraction to light varied between Trichoptera species and females were more attracted than males. Day‐, evening‐ and especially night‐active species were all attracted to light. Light catches of day‐ and evening‐active Trichoptera could partly be a consequence of atypical flight activity, i.e. they are deceived to take flight when a lamp is lit during night.
In all, artificial light can alter Trichoptera populations, sex ratios and species composition. This impact should be considered when erecting and managing light sources near waterways.

中文翻译：

夜，光和飞行：Trichoptera的光景点

人造光是城市环境的重要和必要组成部分，但是光可能会对各种生物种群产生实质性的直接和间接影响。城市地区通常靠近水，因此依赖水的生物可能特别脆弱。毛鳞翅目是淡水中最丰富的昆虫纲之一，但尚未详细分析其对光的吸引力。
我们对比了瑞典三个地点的光阱和无源阱的捕获量。
结果表明，人造光可以影响毛鳞翅目种群。鳞翅目物种之间光的吸引力有所不同，雌性比雄性更受吸引。白天，晚上和特别是夜间活动的物种都被吸引。白天和晚上活跃的毛鳞翅目昆虫的捕获部分可能是非典型飞行活动的结果，即，当夜间点亮灯时，它们被诱骗飞行。
总而言之，人造光可以改变鳞翅目的种群，性别比和物种组成。在水路附近建立和管理光源时，应考虑到这种影响。

更新日期：2019-09-06

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